Many abandonware websites host ISO files of the CS 1.4 disc. However, the ISO is useless without a valid CD key during installation. Some forums share "generated" keys, but these often fail online checks or are banned from private servers.
The servers were shut down over 15 years ago. Furthermore, using key generators to play online today is an exercise in frustration, if not danger. A modern, completely legal, and safe alternative exists that solves all of these problems:
Always prefer verified, legal purchases when seeking original keys or installers to ensure correct licensing, compatibility, and to support preservation efforts.
The exact your vintage machine runs (e.g., Windows XP, Windows 10/11 compatibility mode).
Are you trying to get an original to run on a modern Windows PC? Share public link
Retail copies of Counter-Strike 1.4 (often bundled as part of the Counter-Strike: Retail standalone or the Half-Life: Adrenaline Pack
The original master servers that authenticated 13-digit or 25-digit Half-Life and Counter-Strike retail CD keys were permanently turned off by Valve decades ago.